摘要
为合理确定排水沥青混合料的目标空隙率,对比了不同级配排水沥青混合料在不同设计空隙率条件下的高、低温路用性能与透水性能,研究了不同级配排水沥青混合料的微细观空隙直径期望值变化趋势,建立了排水沥青混合料微细观空隙直径期望值与宏观性能的相关性。结果表明:随着空隙率增大,排水沥青混合料高温抗车辙性能先减后增,低温抗裂性能持续降低;增大空隙率和增加公称最大粒径均能明显增强排水沥青混合料的透水性能,兼顾排水沥青混合料路用性能与排水性能的均衡,推荐排水沥青混合料的目标空隙率为20%~21%;微细观空隙直径期望值与排水沥青混合料的透水系数、贯入剪切强度及低温抗弯拉强度之间的拟合关系良好,从微细观空隙结构角度验证了推荐目标空隙率的合理性。研究成果为排水沥青混合料配合比设计选择目标空隙率提供参考。
To accurately determine the target voidage of asphalt mixtures,this study compared the road performance and water permeability of asphalt mixtures of various grades under different design voidage conditions at both high and low temperatures,the anticipated trends in micro-void diameters for asphalt mixtures of different grades were investigated.Subsequently,a correlation was established between the expected values of micro-void diameters and the macroscopic properties of asphalt mixtures.The results indicate that as voidage increases,rutting resistance at high temperatures initially decreases before increasing,while cracking resistance at low temperatures continuously diminishes.Increasing the voidage ratio and nominal maximum particle size significantly enhances the permeable performance of drained asphalt mixtures.Considering the balance between road performance and drainage efficiency,the recommended target voidage for drained asphalt mixtures is 20%to 21%.A strong fitting relationship exists between the expected diameter of micro-voids and the permeability coefficient,penetration shear strength,and low-temperature flexural tensile strength of drained asphalt mixtures,thereby validating the rationality of the recommended target voidage from a microscopic void structure perspective.the research results can provide reference for the selection of target voidage in the design of the mix ratio of drainage asphalt mixture.
作者
贾丽晓
刘永梅
JIA Lixiao;LIU Yongmei(Shijiazhuang Municipal Engineering Design&Research Institute Co.,Ltd.,Shijiazhuang 050000,China)
出处
《粉煤灰综合利用》
2025年第2期144-150,共7页
Fly Ash Comprehensive Utilization
关键词
排水沥青路面
排水沥青混合料
空隙率
透水系数
路用性能
微细观空隙结构
porous asphalt pavement
porous asphalt mixture
void ratio
permeability coefficient
road performance
microscopic void structure
